• 1 Vote(s) - 5 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Heat Issue
#1
Hello all,

Have a 73 convertible with 351-2V auto, dual exhausts, no A/C. Has the two vents with pull knobs to let "fresh" air into passenger compartment. Inside of car is VERY hot ! Vents blow hot air, (ambient temp). Is this normal ? Anything I can do to improve the overall heat issue other than installing A/C ? Heat seems to come from floor, firewall etc.

Thanks
  Reply
#2
Heat from the floor area may indicate retarded timing. Meaning, that your ignition system is burning fuel as it enters the exhaust manifold.

Do you have a timing light to check your initial and vacuum advanced timing?
  Reply
#3
CZ-75;194305 Wrote:Heat from the floor area may indicate retarded timing. Meaning, that your ignition system is burning fuel as it enters the exhaust manifold.

Do you have a timing light to check your initial and vacuum advanced timing?

I don't but I will have that checked .... thanks.

steve
  Reply
#4
Maybe the blend door (under the dash) is not working, letting the heater air in also?

Pete - MotoArts Decals and Signs
'71 Sportsroof 351C-4V/4-speed - FINALLY under construction - no, wait, on hold again...
'90 Mustang 7-Up 5.0 ragtop, rolling beater
'66 Sunbeam Tiger Mk.IA, survivor
  Reply
#5
if the heat is coming through the firewall and floor and not from the heater itself then you want to look at the exhaust.
you could have retarded timing, headers, or the exhaust is too close to the floorboards of the car.

you can wrap headers or exhaust pipes to lessen the heat transfer.

you should check the motor timing to see if something changed, you could advance the timing 1-2 degrees and see if things improve.

if you do find that the heatercore is the source of the heat you could install a manual shutoff valve on the water pump that feeds the heatercore in the car, you would then pinch off the heatercore and have cooler blown air from the vents.
A/C cars have a vacuum control valve that provides this pinch off of hot coolant to the heatercore when the a/c is running.

now you could have an issue with the blend door on the heater box also, but you would have to start taking things apart to find out.
  Reply
#6
Ya check the cowl seal to the hood ? If the seal doesn't seal 100% your fresh air vents are going to blow hot air

LOVE OF BEAUTY IS TASTE..THE CREATION OF BEAUTY IS ART
  Reply
#7
Qcode351mach;194338 Wrote:Ya check the cowl seal to the hood ? If the seal doesn't seal 100% your fresh air vents are going to blow hot air

Hello,

Thanks for the info. Can you go into a little more detail for me please. Is the seal between the back edge of the hood and the top of the firewall ? Not sure ... thanks again.

Steve
  Reply
#8
naa10104;194423 Wrote:
Qcode351mach;194338 Wrote:Ya check the cowl seal to the hood ? If the seal doesn't seal 100% your fresh air vents are going to blow hot air

Hello,

Thanks for the info. Can you go into a little more detail for me please. Is the seal between the back edge of the hood and the top of the firewall ? Not sure ... thanks again.

Steve
Yes thats it..should be in front of the 2 plastic vent screens on top of the cowl..Alot of times the original is flattened dry..You can check by putting a flashlight drop light in the motor compartment close the hood look in from the windshield side (do it at night) If you see light it's not sealed.

LOVE OF BEAUTY IS TASTE..THE CREATION OF BEAUTY IS ART
  Reply
#9
Qcode351mach;194426 Wrote:
naa10104;194423 Wrote:
Qcode351mach;194338 Wrote:Ya check the cowl seal to the hood ? If the seal doesn't seal 100% your fresh air vents are going to blow hot air

Hello,

Thanks for the info. Can you go into a little more detail for me please. Is the seal between the back edge of the hood and the top of the firewall ? Not sure ... thanks again.

Steve
Yes thats it..should be in front of the 2 plastic vent screens on top of the cowl..Alot of times the original is flattened dry..You can check by putting a flashlight drop light in the motor compartment close the hood look in from the windshield side (do it at night) If you see light it's not sealed.

Thanks, might take a little while, but I will let you know what I find.
  Reply
#10
naa10104;194468 Wrote:
Qcode351mach;194426 Wrote:
naa10104;194423 Wrote:Hello,

Thanks for the info. Can you go into a little more detail for me please. Is the seal between the back edge of the hood and the top of the firewall ? Not sure ... thanks again.

Steve
Yes thats it..should be in front of the 2 plastic vent screens on top of the cowl..Alot of times the original is flattened dry..You can check by putting a flashlight drop light in the motor compartment close the hood look in from the windshield side (do it at night) If you see light it's not sealed.

Thanks, might take a little while, but I will let you know what I find.

Hello,

You were right .... there is no cowl seal period. The mounting holes are there but no seal/weatherstrip. I will order one from CJponyparts and get it installed. Thanks again !
  Reply
Share Thread:  


Possibly Related Threads...
Thread Author Replies Views Last Post
arrow Lighting Issue Don614856 12 233 09-19-2018, 05:59 PM
Last Post: NOT A T5
Stop Starting issue Don614856 6 150 09-17-2018, 11:49 AM
Last Post: Hemikiller
  Starter Heat Soak Spike Morelli 5 1,259 06-30-2015, 07:41 AM
Last Post: 73QCodeGrande
nuke Help with overheating issue :( PolishedTurd 14 2,003 06-17-2015, 08:47 PM
Last Post: EBSTANG
  heat shields savagess 7 924 06-16-2015, 04:25 AM
Last Post: savagess
  Battery Heat Shield Application? jeff8877 4 809 07-30-2014, 11:07 AM
Last Post: bkdunha
  NEW PART - Heat A/C control panel bkdunha 17 1,622 02-28-2014, 11:25 AM
Last Post: Don65Stang
  Staggered shock exhaust issue 71JCode 14 2,287 09-22-2013, 11:06 PM
Last Post: 71JCode



Users browsing this thread: 1 Guest(s)